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Offlinelost87
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Registered: 05/12/15
Posts: 206
Last seen: 1 year, 5 months
What’s the best time/way to repot?? * 1
    #26476791 - 02/09/20 10:59 AM (3 years, 11 months ago)

from people with experience,I would like to
Repot my cacti,some are a couple feet tall.
Most are in terra-cotta pots and have been for
The past three years.
the soil in the pots look Spent and I want to
Upsize any way.they are in 12” now.
I don’t want to break the old pots.
What’s the best way to Safely not cause
any damage to my cacti or pots?
how much bigger of a pot is
suitable?
What time of year is best to repot
Also it’s bridge,Cuzco,Pedro.


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OfflineDancingWolf
FluffButt
I'm a teapot


Registered: 08/31/19
Posts: 797
Last seen: 1 month, 4 hours
Re: What’s the best time/way to repot?? [Re: lost87]
    #26476976 - 02/09/20 01:36 PM (3 years, 11 months ago)

Generic terracotta is cheap compared to a plant that took years to grow but since you don't want to break the pot, we will skip that.

Re-potting times are more region dependent and since I'm in zone 8B in Texas, I personally prefer spring or fall to re-pot cactus. Plants are heat stressed in the summer time, bacteria and fungus are rampant and its asking for problems. Plants are dormant in winter and new root growth will be fairly slow. For me, I'm just starting the golden period to do all my re-potting and with an exceptionally mild winter, I get a head start. Someone in Idaho or Montana will need to wait until around May.

If you want to transplant without breaking the pot, you have to use a piece of metal to scrap all around the inside of the pot and break the roots from it while the plant is upright. Then, tip the plant over on its side and push from the bottom if you put a few rocks over the drain hole, while also pulling the base of the plant out of the pot. Alternatively, you can keep the plant upright and use a towel to pull it out while holding the pot with your feet. You can also wrap towels around the tops of the plant to prevent damage to them.

Don't worry about tearing up the roots, you are knocking all the old dirt off of them anyway and trimming them back about 2/3rds or more. Be aggressive with trimming them, its a cactus / succulent, it will grow more. Trimming the roots stimulates new healthy root growth in the new dirt and could be said to make the plant younger. Trimming the roots also makes them more manageable when re-potting and you don't have to fight them, or fold them over to get them into the container. Folding or wadding up roots isn't ideal and will just bind the roots. You will need to stake a large specimen upright for a month or more, I have one plant that weighed several hundred pounds before pruning and 60-80 after. Since the roots are hard wood, it will take months for it get a foundation established.

Once you finish trimming the roots back, dust them with powdered sulfur to keep fungus and bugs away from the roots. You can let the roots callous over for a day or two, or do what I do and replant immediately. When you replant in the spring, or fall, the dirt may have some natural or light moisture in it, comparable to damp sifted compost or forest topsoil. In the summer or winter, if you so dare to re-pot in those seasons, the dirt should be absolutely bone dry without any hint of moisture at all. The dirt should be so dry that it makes a dust cloud in the air and you sneeze from it. Bugs, larva, etc, will go straight for the roots in summer time so keeping the soil inhospitable for life is required. 

The soil you use is the most critical aspect to allowing your cactus to thrive. I've had 1' San Pedro cuttings put on 2-3' in their first year simply from being put in 15-20 gallon pots with gravel and worm castings at a 1:1 ratio, although I don't use that mix anymore since it compacted too much after two years. Make sure your soil is loaded with good microbes to keep it healthy, but that is its own topic.

Cactus are a lot like bonsai when it comes to growth, if you want it to grow big and get thickness or height in a reasonable amount of time, you have to put it in a grow bucket rather than a show pot. The bigger the bucket, the better. This is double edged sword because a bigger pot will retain moisture longer and is only suitable for certain types of cactus, mainly forest and tropical.

My 1' Pedros are going into three gallon root pouches so the roots are pruned by air / lack of soil moisture and don't bind up like they would in plastic pots, so so I hope. Bigger plants go into 5-20 gallon nursery buckets for maximum growth.


Edited by DancingWolf (02/09/20 01:44 PM)


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OfflineSpicy
Symbiont


Registered: 01/22/13
Posts: 208
Last seen: 1 month, 19 days
Re: What’s the best time/way to repot?? [Re: DancingWolf]
    #26478282 - 02/10/20 10:10 AM (3 years, 11 months ago)

Spring is best but I have done winter as well.

Break the pots it’s easiest. If plastic use a dremel to cut the four corners then peel it back. Look at my pictures for repotting a big one. No damage to roots this way or plant.

You can try to lay it on it’s side and give it a full roll then slide it out but breaking is better.

Put it in the biggest pot possible or in ground if you can


--------------------
Everything has beauty, not everyone sees it.
Perfection is subjective!


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OfflineSpicy
Symbiont


Registered: 01/22/13
Posts: 208
Last seen: 1 month, 19 days
Re: What’s the best time/way to repot?? [Re: Spicy] * 1
    #26478287 - 02/10/20 10:12 AM (3 years, 11 months ago)



--------------------
Everything has beauty, not everyone sees it.
Perfection is subjective!


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